If you hewed to the ops memes incorrect description, Memphis would have been the 80s and mid 90s. It’s interesting that the meme takes into consideration the concept of the long 70s but then just goes back to ten year distinctions. windows 3 (I assume you’re not talking about the early dos shell stuff because no one ever is and you put it squarely amongst the contemporaries of 95, but I’ll give the benefit of the doubt since we’re talking design language) went from ‘90-2003 (with ME) macos 7-9 spanned ‘91-2001 and beos was 95-2000.

It’s possible you aren’t sticking to that flawed understanding though, so let’s talk about design language and Memphis. You’re right that designs are informed by their tools and mediums. For Memphis group those tools were drafting paper and those mediums were chipboard and naugahide. Memphis group made couches and shelves, not software or digital art.

Now that’s not to say that only stuff from a specific cadre of Italian designers made during a short period is Memphis and everything else is sparkling crayon scribbles, only that the stuff we actually recognize as Memphis wasn’t pixel art by any measure.

Most of what is in the meme under Memphis isn’t even Memphis though, it’s pop art. I think the pants are a haring print…

With all that said, what about windows (were you talking about windows 3+?), macos 7-9 and beos would you say were sparkling crayon scribbles, pop art or genuinely drawing from the design language of the Memphis group?